Are you a hidden genius? Take the test and find out

It's a brainteaser that has been doing the rounds for a few years - but this intelligence quiz can apparently separate the geniuses from the regular folk.

Just looking at this gives me wet palms. Numbers and I have had a very unforgiving relationship over the years.

I have such clear memories sitting with my mom doing afternoon homework and tensions rising as I stared vacantly at the numbers on the page. I didn't connect with square roots, prime numbers, and the like.

Here, you have a go. Good luck!

If you are still stumped, here's an explanation...